Rock Valley Fault Zone Absolute and Relative Earthquake Relocation to Improve Geologic Models

On the Segmentation of the Cephalonia–Lefkada Transform Fault Zone (Greece) from an InSAR Multi-Mode Dataset of the Lefkada 2015 Sequence

Remote Sensing ◽

10.3390/rs11161848 ◽

2019 ◽

Vol 11 (16) ◽

pp. 1848

Author(s):

Nikos Svigkas ◽

Simone Atzori ◽

Anastasia Kiratzi ◽

Cristiano Tolomei ◽

Andrea Antonioli ◽

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Keyword(s):

Fault Zone ◽

Surface Displacement ◽

Interferometric Synthetic Aperture Radar ◽

Transform Fault ◽

Earthquake Relocation ◽

The North ◽

Available Information ◽

Multi Mode ◽

Additional Constraints ◽

Transform Fault Zone

We use Interferometric Synthetic Aperture Radar (InSAR) to study the Cephalonia–Lefkada Transform Fault Zone (CTF) in the Ionian Sea. The CTF separates continental subduction to the north from oceanic subduction to the south, along the Hellenic Subduction Zone. We exploit a rich multi-modal radar dataset of the most recent major earthquake in the region, the 17 November 2015 Mw 6.4 event, and present new surface displacement results that offer additional constraints on the fault segmentation of the area. Based on this dataset, and by exploiting available information of earthquake relocation, we propose a new rupture process for the 2015 sequence, complementary to those published already. Our modelling includes an additional southern fault segment, oblique to the segment related with the mainshock, which indicates that the CTF structure is more complex than previously believed.

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Earthquake Relocation in Northern Bali Island in 2015-2017 using Double Difference Method (DD)

BULETIN FISIKA ◽

10.24843/bf.2018.v19.i02.p05 ◽

2018 ◽

Vol 19 (2) ◽

pp. 64

Author(s):

Nandaru Diaz ◽

Komang Ngurah Suarbawa ◽

Adityo Mursitantyo

Keyword(s):

Fault Zone ◽

Difference Method ◽

Accurate Result ◽

Seismic Analysis ◽

High Accuracy ◽

Double Difference ◽

Earthquake Relocation ◽

Time Value ◽

Earthquake Distribution ◽

Real Value

A research about earthquake relocation in Northern Bali Island in 2015 – 2017 using the Double Difference (DD) method has been carried out. Earthquake relocation is important to get some informations about earthquake locations with high accuracy, fault zone identification, earthquake distribution and seismic analysis. The results of the relocation indicated that there was a displacement of the location of earthquake that formed moving closer to the earthquake source namely a fault. Relocation using HypoDD program gave high accurate result indicated by the RMS residual time value close to zero e.g. 0,000 - 0.01 which mean the results of calculations and observations are closed to the real value.

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